JPH10228689A - Driving mechanism for magnetic head mounting member and magnetic recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the load of a cam mechanism and the shock noise by constituting the cam part so as to elastically deform. SOLUTION: This mechanism is provided with a cam shaft 41 fixed to a head plate 40 and a cam 10 rotationally driven in the specified direction for changing over the mode from a reproduction mode to a stop mode, and this cam 10 is provided with the cam part 10b for engaging the cam shaft 41 with the reproducing position at the reproduction mode also for guiding it to the end part 10s by changing over the mode and the cam part 10t for guiding the cam shaft 41 which is moved from the end part 10b, to the direction of the stop position by changing over the mode while confronting away with the end part 10s of the cam part 10b, and when the cam shaft 41 is moved to the cam part 10t from the end part 10s by changing over the mode, the dropping distance of the cam shaft 41 to the cam part 10t is reduced by the elastic deformation of at least the end part 10s to the direction of the cam part 10t, thereby the shock noise of the cam shaft 41 due to this dropping is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a tape recorder, and more particularly to a driving mechanism for driving a magnetic head mounting member such as a head plate.

[0002]

2. Description of the Related Art A magnetic recording / reproducing apparatus, for example, a magnetic head mounting member driving mechanism of a tape recorder is shown in FIG.
To FIG. 23 are known.

Hereinafter, description will be given with reference to these drawings.
On the chassis 1, magnetic heads 30 and 31 are mounted on a head plate 40 via a head base 20 which holds them so as to be able to rotate substantially 180 degrees. The head plate 40 is arranged so as to be movable in both directions of arrows AB. On the chassis 1, a tape (not shown) in a cassette tape is
One set of capstans 5 for the forward playback direction and the reverse playback direction so that the capstan 5 is driven at a constant speed.
1 and 61 and pinch rollers 50 and 60 are respectively arranged at appropriate positions.

[0004] Each of the capstans 51 and 61 is provided coaxially with an inertia wheel 54 and 64 for smooth rotation thereof, and includes a motor wheel 100 directly connected to a motor (not shown) and a drive belt. 1
01 is transmitted. The capstan 51 is also provided with a drive gear 52 for driving a cam mechanism, which will be described later, and a drive pulley 53, also for driving the rotation, which will be described later. In order to wind the tape running at a constant speed onto the reel of the cassette tape on the chassis l, a reel unit 81 for forward reproduction and a reel unit 80 for reverse reproduction which engage with each reel hub of the cassette tape are provided. Are arranged at appropriate positions. These reel stands 8
A drive gear 90 and a driven pulley 91 are rotatably disposed on a drive gear lever 92 for winding and rotating each of the rollers 1 and 80, so that rotation is transmitted between the drive pulley 53 and the drive belt 102.

[0005] In order to move the drive gear 90 to the winding position, a drive gear lever 92 is disposed at an appropriate position on the chassis l so as to be movable in both directions of arrows CD. On the chassis 1, a forward playback idler gear 70, which is driven by a drive gear 90 that rotates counterclockwise to match the rotation direction of the reel base and engages with the forward playback reel base 81, is rotatably arranged. I have. A cam shaft 41 in a cam mechanism described later is fixed to the head plate 40, and a spring 4 is used for pressing the head plate 40 in the B direction.
2 are installed. A spring 94 is attached to the chassis 1 for pressing the drive gear lever 92 in the direction D. On the chassis 1, a disk-shaped control cam 10 for mode switching operation of the head plate 40 and the drive gear lever 92 is rotatably arranged.

In the above configuration, when a tape cassette is set and, for example, a reproduction mode is selected by operating a mode selection switch (not shown), the capstan 51 starts to rotate according to the drive of the drive motor, The control cam 10 is rotated by the drive gear 52 receiving the driving force of the drive motor by the action of the solenoid and the cam trigger means (not shown),
Further, by the action of the cam trigger means, the cam branch point is branched to a necessary direction, and the head plate 40 fixed to the cam shaft 41 is advanced in the direction A, and the heads 30 and 31 are moved.
Is brought into contact with the tape, and the pinch roller 50 is brought into contact with the capstan 51. At the same time, by the action of the control cam 10, the solenoid (not shown) and the cam triggering means, the drive gear lever 92 rotates in the direction D to engage the drive gear 90 with the forward regeneration idler gear 70, thereby increasing the rotational force for forward regeneration. The information is transmitted to the reel base 81.

With the above operation mechanism, a reproduction mode is set as shown in FIG.

Similarly, when the stop mode is selected from the reproduction mode and the mode is switched, the control cam 10 is rotated by the driving gear 52 receiving the driving force of the driving motor by the action of the solenoid and the cam trigger means (not shown). The head plate 40 is retracted in the direction B by the action of the spring 42 to separate the heads 30 and 31 from the tape, and the pinch roller 50 is moved to the capstan 5.
Separate from 1. At the same time, control cam 1
0, the drive gear lever 92 is rotated in the C direction by the action of a solenoid and cam trigger means (not shown) to drive the drive gear 90 to the forward regeneration idler gear 70.
, And the rotational force is reduced to the forward playback reel base 81.
Will not be transmitted.

With the above operation mechanism, the stop mode is set as shown in FIG.

The outline of the conventional tape recorder is configured as described above, but the head plate driving surface of the control cam 10 has a shape as shown in FIGS. That is, since the control cam 10 is driven by the driving gear 52 that rotates counterclockwise, it has a toothless portion at the stop position 10f and the operating position 10g, and is used after being intermittently rotated clockwise. . Also, the control cam 10
In order to move the head plate 40 in the AB direction, the camshaft 4
It has cam portions 10a and 10b for one movement, and cam portions 10c, 10d and 10e for rotating the head by approximately 180 degrees and switching the pinch rollers (not shown). When the control cam 10 is rotated by 245 degrees clockwise from the stop position in FIG. 20, the operation position becomes the operation position in FIG. 21, and the cam groove contact portion 4la of the cam shaft 41 moves from the stop position [J] in FIG. When the head plate 40 is moved to the reproduction position [E, the head plate 40 is moved in the direction A to enter the reproduction mode. The cam groove contact portion 41a
Is moved from the stop position [J] in FIG. 20 to the fast-forward / rewind position [K] in FIG.
0 does not move and enters the fast forward / rewind mode. Similarly, when the control cam 10 is rotated 115 degrees clockwise from the reproduction or fast-forward / rewind operation position [E] / [K] in FIG. 21, the control cam 10 becomes the stop position [J] in FIG. The cam groove contact portion 41a is moved from the reproduction position [E] in the reproduction mode in FIG. 21 and the [K] position in the fast forward / rewind position mode to the stop position [J] in FIG. The plate 40 is moved in the direction B by the pressing of the spring 42 to enter the stop mode. FIG. 22 shows their positional relationship and arrows indicating the movement path of the cam groove contact portion 41a. In particular, at the time of transition from the reproduction position [E] in the reproduction mode to the stop position [J] in the stop mode, the cam groove contact portion 41a is moved from each position [E] → [F] →
[G] → [H] → [I] → [J], and the moving speed of the cam shaft 41, that is, the B
The moving speed in the direction is made zero between the positions [F] → [G], and the cam shaft 41, that is, the head plate 40 is pressed and dropped only in the section [H] → [I], so that the head plate 40 [E] ⇒ Shock noise is reduced compared to dropping to [I] at once.

[0011]

The conventional magnetic head mounting member, that is, the head plate driving mechanism is constructed as described above. However, the control cam of the control cam is moved from the operating position [E] [K] to the stop position [J]. Since a rotation angle of 115 degrees is required, the angle assigned to other operations becomes small, and for example, when shifting from the stop mode to the reproduction mode, the cam shaft is pressed against the pressing spring to the reproduction position of the second cam portion. It is necessary to take a large amount of lift per cam rotation angle when lifting and the cam rotation force increases,
The load on the cam mechanism increases, which not only increases the power consumption but also reduces the durability. In addition, a large motor is required to drive the cam mechanism. Had been an issue.

Further, conventionally, even if the shock noise can be reduced as described above, the distance between [H] and [I] between the operating position [E] and the stop position [J] is still small. If the shock noise is heard from the operating position to the stop position, it is very annoying to avoid the occurrence of shock noise caused by the pressure drop of the head plate at For the user, there has been a problem that there is an extremely malfunction.

[0013]

According to a first aspect of the present invention, there is provided a magnetic head mounting member driving mechanism, comprising: a cam follower fixed to the magnetic head mounting member; and a predetermined direction for switching a mode from a reproduction mode to a stop mode. At least in the reproduction mode, the control cam moves the cam shaft of the cam follower from the reproduction position to the cam shaft moving direction side end position by the mode switching. A first cam portion to be guided and a cam which is separated from and opposed to a cam shaft moving direction side end of the first cam portion and which is shifted from the cam shaft moving direction side end of the first cam portion by the mode switching. A second cam portion for guiding the shaft in the stop position direction, and at least an end of the first cam portion on the cam shaft movement direction side is the second cam portion. The above-mentioned problem is solved by being characterized by being configured to be elastically deformable in the direction, whereby the cam follower moves from the cam shaft moving direction side end of the first cam portion to the second cam portion. , And the distance of the falling and moving can be reduced.

In the magnetic head mounting member driving mechanism according to a second aspect of the present invention, at least a gap between a cam wall at an end of the first cam portion on the cam shaft moving direction side and an opposing wall facing the cam wall is provided. The cam follower has a width smaller than the shaft diameter, and when the shaft portion of the cam follower passes through the gap, the cam shaft moving direction side end receives the acting force in the elastic deformation direction from the opposed wall. The above-mentioned problem has been solved by the feature that the distance of the cam follower to be pressed and dropped can be reduced.
When the cam angle of the cam portion is shifted from the stop mode to the reproduction mode, the load for raising the cam shaft to the reproduction position of the second cam portion can be reduced so that the load can be reduced, so that the load on the entire cam mechanism can be reduced. With
Furthermore, since the camshaft can be provided with a moving force in the same direction as the pressing spring that urges the head plate toward the stop position, the load of the pressing spring can be reduced, and the load on the entire cam mechanism can be reduced. it can.

In the magnetic head mounting member driving mechanism according to a third aspect of the present invention, at least a portion of the second cam portion opposed to an end of the first cam portion in the cam shaft movement direction is elastically deformable. This feature solves the above-described problem. In addition to reducing the distance of the cam follower to be pressed and dropped, the cam follower can be moved from the end of the first cam portion in the cam shaft movement direction side to the second end. The impact force due to the pressure drop to the cam portion is reduced, and the shock noise at the time of the drop can be reduced.

A magnetic recording / reproducing apparatus according to a fourth aspect of the present invention includes the magnetic head mounting member driving mechanism according to any one of the first to third aspects, and can drive the magnetic head mounting member with low power consumption. In addition, shock noise is reduced at the time of transition from reproduction to stop.

The magnetic head mounting member in each claim should not be construed as being limited to the head plate of the embodiment described below, but drives the magnetic head between the reproduction position and the stop position. It should be widely interpreted to include all the members for fixing the magnetic head in order to cause the magnetic head to be fixed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head mounting member driving mechanism according to an embodiment of the present invention and a magnetic recording / reproducing position using the same will now be described with reference to FIGS.
This will be described in detail with reference to FIG. However, since the present invention is substantially limited to the shape of the cam portion of the control cam, other magnetic recording / reproducing devices such as a tape recorder portion are provided in the same manner as those shown in FIG. In addition, in each of the drawings, portions corresponding to those of the related art are denoted by common reference numerals. Also, different reference numerals are given to the respective cam portions described later, but for convenience of explanation, these are assigned with different functions and the like. The invention is not limited by such reference numerals, nor by the same cam portions. Also,
The name of the control cam is also for convenience of explanation, and is not narrowly interpreted as being limited to only the cam having the control function. Further, in the embodiment of the present invention, the magnetic head mounting member is the head plate 40, but the present invention is not necessarily limited to this, and includes any member or element capable of mounting and fixing the magnetic head.

As shown in FIGS. 1 and 2, the control cam 10 of the present invention has a front surface serving as a driving surface of the head plate 40 (head plate driving surface), and a rear surface serving as a driving surface of the driving gear lever 92 (drive gear lever driving surface). ). As shown in FIG. 1, a cam portion 10 having the same shape and the same function as the conventional one is provided on the head plate driving surface of the control cam 10.
a to 10 g. These front side cam portions 10a to 10a
Since each of 10g has been described with reference to FIG. 20, the detailed description is omitted here. As shown in FIG. 2, cam portions 10h to 10j for moving the drive gear lever 92 of the control cam 10 and cam portions 10k to 10n for cam triggers (not shown) are provided on the drive surface of the drive gear lever of the control cam 10. And These cam parts 10a to 10g and cam parts 10h to
In order to show the correspondence with 10n, cam portions 10h to 1g indicated by solid lines in FIG.
0n is indicated by a dashed line.

The control cam 10 is made of a material such as polyacetal resin by an injection molding method, and is a sectional view taken along the line AA of FIG. Cam groove contact part 41a
And the drive gear lever 92 are shown at the same time for understanding. ), Cam portions 10a to 10g are formed from the head plate driving surface on the front side to a predetermined thickness.
The cam portions 10h to 10n are formed from the drive gear lever drive surface on the back side to a predetermined thickness, and a hole 10q is provided from the gap between the cam portions 10h to 10j on the drive gear lever drive surface. As shown by the cross hatching in FIG.
The 0s and 10t portions can be formed into a thin molded elastic body.

The control cam 1 having such a structure
0, the rotational position shown in FIG. 5 (the cam groove contact portion 41a of the cam shaft 41 is positioned at the position [E] on the cam portion 10b).
And the cam groove contact portion 41a is
Is rotated from the position S1) to the cam groove contact portion 41a of the camshaft 41 with the rotation.
The control cam 10 moves from the reproduction operation position [E] of the cam portion 10b to the stop position [J] of the cam portion 10a, but the position of the cam groove contact portion 41a itself is changed from S1 to S2 by a two-dot chain line. The head plate 40 is moved correspondingly. The cam groove contact portions 41a are provided between the cam portions 10r and 10r from the cam portion 10b at the reproducing operation position [E] to the cam portion 10a at the stop position [J].
s (Since the cam portion 10s is integral with the cam portion 10b, it also becomes the cam shaft moving direction side end of the cam portion 10b.
Further, since the cam portion 10t is also integral with the cam portion 10a, the cam portion 10t also serves as an opposing portion of the cam portion 10a which is separated from and opposes the cam portion 10s. 6), the gap W1 between the cam portions 10s and 10r (the cam wall of the cam portion 10s and the cam wall of the cam portion 10r) is formed as shown in FIG. Since the diameter D1 of the contact portion 41a is smaller than the diameter D1, the cam groove contact portion 41a is moved from the cam portion 10r to the cam groove contact portion 41a when the cam groove contact portion 41a passes through the gap W1.
It will receive a force in the direction. In this case, along with the rotation of the control cam 10, the cam portion 10r extends along the line L2 direction forming an angle θ1 in FIG. 6 with respect to the line segment L1 in the B direction, and when the control cam 10 further rotates, the angle becomes linear. Since it has a cam surface shape along the direction of a line segment L2 'that forms an angle θ2 with respect to the segment L1, the cam groove contact portion 41a exerts a force in the direction of pushing down the head plate 40 in the B direction by the cam portion 10r. Will receive it. After all, the cam groove contact portion 41a is the control cam 1
During the period from the reproduction operation position [E] on 0 to the stop position [J], the position is moved from position S1 to S3 to S4 to S2. The control cam 10 is shown in FIG. 8 so that the front cam portion 10s, which is a thin molded elastic body portion, is not damaged due to a large displacement that would cause it to rotate in the reverse direction. As shown, a displacement stopper 10p is provided to prevent the cam portion 10s from being displaced more than necessary.

Control cam 1 having the above functions
0 will be described in more detail with reference to FIGS. 9 and 10 show a stopped state, FIGS. 11 and 12 show a forward reproduction state, and FIGS. 13 and 14 show a reverse reproduction state. 9 and FIG.
1, FIG. 13 shows each cam portion 10a-10 of the head plate driving surface.
g, and FIGS. 10, 12, and 14 show the cam portions 10h to 10n of the drive gear lever drive surface by broken lines, and the drive gear lever 92 and the like by solid lines. As shown in FIGS. 9 and 10, when the control cam 10 is rotated 260 degrees clockwise from when the cam groove contact portion 41a is at the stop position [J], the forward reproduction operation position shown in FIGS. 13 and FIG. 14, and the cam groove contact portion 41a is moved from the stop position [J] in FIG. 9 to the operation position [E] in FIG. 11 or FIG. The head plate 40 is moved by a stroke by a distance D in the parallel direction between the line M1 and the line M shown in FIG.
Is moved in the direction A in FIG. 18 to enter a forward reproduction or reverse reproduction mode. Also, cam groove contact portion 41a
Is moved from the stop position [J] to the position [K], the head plate 40 does not move, and the mode is set to the fast forward / rewind mode.

At the same time, the cam portions 10h to 10n for driving the driving gear lever 92 of the control cam 10, the cam contact portion 92a of the driving gear lever 92, the solenoid (not shown) and the cam triggering means act.
The cam branch point is branched to a necessary direction, and the drive gear 90 is rotated in the direction D as shown in FIGS. 10 to 12 for forward reproduction, and is rotated in the direction C as shown in FIGS. 10 to 14 for reverse reproduction. By rotating, a forward reproduction mode and a reverse reproduction mode are set, respectively.

Similarly, the control cam 10 is moved clockwise from the forward reproducing operation position (FIGS. 11 and 12) or the reverse reproducing operation position (FIGS. 13 and 14).
By rotating the cam shaft 41 by 0 degree, the cam shaft 41 comes to the stop position (FIGS. 9 and 10), and the cam groove contact portion 4la of the cam shaft 41 is moved from the operation position [E] to the stop position [ J], the head plate 40 moves in the B direction and enters the stop mode.

FIG. 15 schematically shows the movement of the cam groove contact portion 41a from FIGS. 9 to 14 from the stop mode to the reproduction mode or from the fast-forward / rewind mode to the stop mode. When shifting from the fast-forward / rewind mode to the stop mode, the cam groove contact portion 4
1a moves from a fast-forward / rewind operation position [K] → intermediate position [I] → stop position [J] as shown in FIG. 16, and the control cam 10 moves near the intermediate position [I].
17 while the cam portion 10s, which is a molded elastic body portion, is elastically deformed in the R direction while moving from the reproduction mode to the stop mode. As shown, the forward or reverse playback operation position [E] → the intermediate position [H] → the intermediate position [I] → the stop position [J], and the intermediate position [H]
In the vicinity, the cam portion 10s moves while being elastically deformed in the S direction by the force generated by the rotational force of the control cam 10.

[0026]

According to the present invention, effects can be obtained as described above.

According to the first aspect of the present invention, at least a cam follower fixed to the magnetic head mounting member and a control cam rotatably driven in a predetermined direction for switching the mode from the reproduction mode to the stop mode are provided. The control cam includes a first cam portion that guides a cam shaft of the cam follower from a reproduction position to a cam shaft movement direction side end position by the mode switching at least in a reproduction mode, and the first cam portion. And a second cam portion for guiding the cam shaft, which has been shifted from the cam shaft movement direction end of the first cam portion by the mode switching, toward the stop position in the direction of the cam shaft movement direction. And at least the end of the first cam portion on the cam shaft movement direction side is configured to be elastically deformable in the direction of the second cam portion. The distance that the cam follower falls from the cam shaft moving direction side end to the second cam portion can be reduced by the elastic deformation of the cam shaft moving direction side end, thereby reducing the load on the cam mechanism and reducing power consumption. It is possible to reduce the impact force due to the pressure drop from the cam shaft moving direction side end of the first cam portion of the cam follower to the second cam portion. Shock noise can be reduced, and the reduction of the shock noise can reduce unpleasant sounds and is extremely convenient for the user.

According to a second aspect of the present invention, at least a gap between a cam wall at an end of the first cam portion on the cam shaft moving direction side and an opposing wall facing the cam wall is smaller than a shaft diameter of the cam follower. When the cam follower shaft portion passes through the gap, the cam shaft moving direction side end receives the acting force in the elastic deformation direction from the opposing wall. In addition to being able to reduce the distance that the cam follower pushes and falls, the rotation angle of the control cam is reduced to 100 degrees from the operating position to the stop position, and the cam rotation angle of the first cam portion is reduced. In order to reduce the rotational force for lifting the camshaft up to the regenerating position of the second cam portion against the pressing when shifting the lifting amount per stop from the stop mode to the reproducing mode. As a result, it is possible to reduce the load on the entire cam mechanism, thereby reducing power consumption and improving durability, and it is not necessary to use a large motor for driving the cam mechanism. In addition to reducing the size of the playback device, the camshaft can be given a moving force in the same direction as the pressing spring that urges the head plate toward the stop position, so that the load of the pressing spring can be reduced, The load on the entire cam mechanism can be reduced.

According to a third aspect of the present invention, at least a portion of the second cam portion facing the cam shaft moving direction end of the first cam portion is made elastically deformable. The impact force caused by the pressure drop from the cam shaft moving direction side end of the cam portion to the second cam portion can be reduced, and the shock noise at the time of the drop can be reduced.

According to a fourth aspect of the present invention, since the magnetic head includes the driving mechanism according to any one of the first to third aspects, the head plate to which the magnetic head is fixed is driven with low power consumption and excellent durability. A magnetic recording / reproducing apparatus with little shock noise at the time of transition from reproduction to stop.

[Brief description of the drawings]

FIG. 1 is a plan view in a stop mode of a head plate driving surface of a control cam in a magnetic head mounting member driving mechanism according to an embodiment of the present invention.

FIG. 2 is a plan view of a drive gear lever driving surface of a control cam in a stop mode in the magnetic head mounting member driving mechanism according to the embodiment of the present invention;

FIG. 3 is a sectional view taken along the line AA of FIG. 1;

FIG. 4 is an enlarged plan view of a main part of FIG. 1;

FIG. 5 is an enlarged plan view of a main part of FIG. 1 in a reproduction mode.

FIG. 6 is an enlarged plan view of a main part of FIG. 1 when a control cam is rotated approximately 37 degrees clockwise from a reproduction mode;

FIG. 7 is an enlarged plan view of a main part of FIG. 1 when a control cam is rotated approximately 45 degrees clockwise from a reproduction mode;

FIG. 8 is an enlarged plan view of a main part of FIG. 1;

FIG. 9 is a plan view of a head plate driving surface of the control cam in a stop mode.

FIG. 10 is a plan view of a drive gear lever drive surface of the control cam in the stop mode.

FIG. 11 is a plan view of a head plate driving surface of a control cam in a forward reproduction mode.

FIG. 12 is a plan view of a drive gear lever drive surface and a drive gear lever of the control cam in the forward reproduction mode.

FIG. 13 is a plan view of a head plate driving surface of a control cam in a reverse reproduction mode.

FIG. 14 is a plan view of a drive gear lever drive surface and a drive gear lever of the control cam in the reverse playback mode.

FIG. 15 is a diagram showing movement of a cam shaft with respect to a control cam.

FIG. 16 is a diagram showing movement of a cam shaft with respect to a control cam.

FIG. 17 is a diagram showing movement of a cam shaft with respect to a control cam.

FIG. 18 is a plan view of a stop mode of the reverse type tape recorder.

FIG. 19 is a plan view of a reverse tape recorder in a forward playback mode.

FIG. 20 is a plan view of a conventional control cam in a stop mode.

FIG. 21 is a plan view of a conventional control cam in a reproduction mode or a fast-forward / rewind mode.

FIG. 22 is a plan view of a main part of a conventional control cam when the cam shaft moves from a stop mode to a reproduction mode or from a fast-forward / rewind mode to a stop mode.

FIG. 23 is a plan view of a main part of a conventional control cam when the camshaft moves from the reproduction mode to the stop mode.

[Explanation of symbols]

 Reference Signs List 1 chassis 10 control cam 20 head base 30 magnetic head 40 head plate 5O forward playback pinch roller 51 forward playback capstan 6O reverse playback pinch roller 61 reverse playback capstan 7O forward playback idler gear 8O reverse playback reel stand 81 Forward playback reel stand 90 Drive gear 92 Drive gear lever 100 Motor wheel

Claims (4)

[Claims] A cam follower fixed to a magnetic head mounting member, and a control cam rotatably driven in a predetermined direction for mode switching from a reproduction mode to a stop mode.
At least in the playback mode, the control cam guides the cam shaft of the cam follower from the playback position to the cam shaft moving direction side end position by the mode switching, and the first cam portion; A second guide for guiding the camshaft, which is spaced from and opposed to the camshaft movement direction end of the one cam portion and which has been shifted from the camshaft movement direction end of the first cam portion by the mode switching, toward the stop position direction. A magnetic head mounting member driving mechanism, wherein at least an end of the first cam portion on the cam shaft movement direction side is elastically deformable in the direction of the second cam portion. . 2. A gap between at least a cam wall at an end of the first cam portion on a cam shaft moving direction side and an opposing wall facing the cam wall has a width smaller than a shaft diameter of the cam follower, 2. The magnetic head mounting member according to claim 1, wherein, when the shaft portion of the cam follower passes through the gap, the cam shaft moving direction side end portion receives an acting force in the elastic deformation direction from the opposing wall. Drive mechanism. 3. The magnet according to claim 1, wherein at least a portion of the second cam portion facing the end of the first cam portion in the direction of movement of the cam shaft is elastically deformable. Head mounting member drive mechanism. 4. A magnetic recording / reproducing apparatus comprising the magnetic head mounting member driving mechanism according to claim 1.